Square shelf sign holder



FIG. 1 is a perspective view of a square shelf sign holder showing my new design with the sign holder being secured on a shelf and holding a sign;

FIG. 2 is a perspective view of the sign holder by itself;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof, with a left side elevational view being a mirror image thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The parts shown in broken lines in FIG. 1 are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a square shelf sign holder, as shown and described. 